When 9.6 grams of NaBr are dissolved in enough water to create a 165-gram solution, what is the solution's concentration, expressed as a percent by mass?
4.8% NaBr
5.5% NaBr
5.8% NaBr
6.2% NaBr
To find the solution's concentration, expressed as a percent by mass, we need to divide the mass of the solute (NaBr) by the mass of the solution and then multiply by 100.
First, we need to calculate the mass of the solute. Given that 9.6 grams of NaBr are dissolved, the mass of the solute is 9.6 grams.
Next, we need to calculate the mass of the solution. The problem states that the solution has a mass of 165 grams.
To calculate the concentration of the solution, we divide the mass of the solute (9.6 grams) by the mass of the solution (165 grams) and then multiply by 100.
(9.6 grams / 165 grams) * 100 = 5.818181818%
Therefore, the solution's concentration expressed as a percent by mass is approximately 5.8% NaBr.